Siemens SITRANS P Betriebsanleitung Seite 112

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characteristic curve vertices. These curve shapes can be stored in the device using
SIMATIC PDM or the HART communicator.
In the calculation example, the value at the input of the characteristic curve is transferred 1:1
to the output.
In
the calculation example, a number of filled cans is set for the output scaling. You can enter
up to five characters for any given unit. Do not confuse this with the user-programmable display
unit of the "Analog output" block.
In the calculation example, you have a start of scale value of 0 cans and a full scale value of
1000 cans. At a process pressure of 0.5 bar, you get a value of 250 cans for the "User" device
variable.
See also
Analog output (Page 114)
Measured value status (Page 110)
7.3.9 Measured value status
Introduction
Every device variable is assigned a status byte to indicate the quality of the measured values.
This status byte can have the following values:
BAD
GOOD
MANUAL
UNCERTAIN
The following values are also possible:
CONSTANT
HIGH LIMIT
LOW LIMIT
A higher-level diagnosis program can display and analyze these states.
GOOD status
During smooth, uninterrupted operation, the measured value status of all active device
variables is GOOD.
BAD/CONSTANT status
All inactive device variables have CONSTANT/BAD status.
If a variable having the BAD status is an output value for calculation, the measured value is
BAD.
Operating functions through HART
7.3 Selecting the measuring modes
SITRANS P, DS III series with HART
110 Operating Instructions, 09/2012, A5E00047092-08
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